I was involved in ministry in Andrah Pradesh [Hyderabad/Secunderbad ] and stalked some by Hindi detectives trying to arrest me.
After 9/11, the Islamists were emboldened, and developed a campaign to convert entire "Dalit" villages to Islam through the elders. They would offer money, and jobs and opportunity in Education. This was very seductive to these people, who were forever chained to their class, almost a "slave" class, which as the lowest, prohibited any upward mobility.
They were the heavy-lifters, street sweepers and house servants to the upper and middle classes, for life. Some villages, [ 50,000-100,000 ] fell to Muslim, and this outraged the Hindi.
Their slave-class was out of the chain,* and as in the Civil War south, this meant an end to very cheap labor, and became a threat to the upper cast income; the wallet.
*[ Just as in the slave days of the south, an "untouchable" has to bow down to the upper class Hindi, and remove himself into the road to allow them unhindered passage.]
So, with vast superiority in their congress, they passed the Non-conversion Laws...which basically prohibits any non-local to speak to another religion concerning conversion. The Hindi economy does not want the Dalit to be free; let them remain as they are; the farm/class...manual labor force. This maintains the status quo.
Originally installed as law, it was primarily aimed at the Muslim encroachment in India, but was liberally used , especially in the cities, against the Christian, and the Western Missionary/Preacher. It was illegal for a Westerner to witness, preach, or even pray with an Indian National in some places. I, as I said, was stalked and watched, but really wasn't hindered.
I have heard from an Indian friend [ Mumbai] that this law has been shut down; but evidently again resurrected?
Hope not....it is from anti-Christian Hinduism's attempt to silence the true gospel.